Igniter.



E: P. DU PONT.

IGNITBR.

APPLICATION FILED 111111.25, 1909.

991,364. Patented May 2, 1911.

ATORNE YS' lNewcastle and State of UNITED sTATEs PATENT oFFIcE.

.IGNITER fspecication of'Letters Patent. -Patented May 2,1911. i

l Application mea Haren 25, 190s. serial No. 485,623.

Referring to the drawings forming apart hereof Figure 1 is a diagrammatic plan View of the improvement. Fig. 2 is a longitud-inal section of the igniter proper. Fig. 8 is a section on the line 3 -3of Fig. 2 and Fig. 4 is a plan view with the plugs arranged to use with a single ignition system.

In the present embodiment of the invention, the plug comprises a ferrule or casing 1, havin-g a reduced portion 2 externally screw threaded for engaging the -threaded opening of the cylinder 3, and the lower end of the ferrule is reduced as at 4 to form a valve seat for a purpose to be presently described. i

A 'shoulder 5 is formed at the unctionof the reduced portion with the body of the ferrule, which shoulder engages the face of the cylinder, rule an internal annular shoulder is pro vided, the ferrule being internally screw threaded above the shoulder as at 7, andan insulating bushing 8 is provided with an ancular flange 9 which rests upon the shoulder 3, and is engaged by a nut 10 engaging the :hreaded portion 7 of the casing, the inner and of thenut resting against the flange.

A tube 1.1 'is-arranged within the bushing, :he lower end of the tube being provided vithan annular flange l2 .against which the )ushing rests and the upper end being exterial'ly screw threaded asat l'and internally hreaded as at 14. A stem or electrode rod 5 is -movable longitudinally of the tube, the ower end of the stem being provided with a 'alve '16 engaging the seat before mentioned, vhile the upper end is screw threaded as. at

for engaging the threads 14 of the tube. The free'end of the stem is squared as at 18, nd is engaged by a socket 19 on the "end of a rank 20. i

Afcap 21 incloses the socket, the lower end f ,the rap being threaded on to the end of he tube, and the upper end is shaped to fit and near the upper end of the ferabove the socket being contracted to engage p 'A coil spring 23 .is ar ranged between the crank and a. flange 24 on the crank as at. 22.

the cap. Thespring 23 retains the socket closely in Icontact with the lreduced portion preventv the .escape of gasesv through the tube, and the'l screw threads 14 of t-he cap to and 1'( of the stem and the ltube respectively are coarse as shown, so that a slight rotation of the stem will move the same a considerable distance longitudinally. The lower end of the stem above the valve is provided with an annular flange 261 forming one of the sparking points, and a spur-,27r on the inner face ofthe casing forms the other.

. It will be ,./evident from the description,

`that when the crank is turned the stem will be constrained todturn therewith and will also move longitudinally lto move the Valve This movement brings the from its seat.

flange 26 into sparking distance of t-he point 27, and the interior of the casing is placed into communication with the interior of the cylinder. l l

In lthefconst-ruction shown in Fig. 1, each cylinder is provi-ded with two plugs and either set may be made use of by manipulating the handles 28, which are connected to links 29 of an insulating material, the handle portion 30 of the cranks being journaled in the links. It will be' understood that each of the' sparking plugs shown in Fig. l is constructed in accordance with the plug shown in Fig. 2, and by closing the valves of the set. not in use, such set Qwill be perfect-ly protected from theproducts of combustion, and from the`intense heat of the combustion chamber. i'

ln Fig. 4 the plugs are shown for use with a single ignition system, the terminals of the system being connected with the `contact Y point '81 on the insulated block 32 and with the cylinder. The point 33 of the switch is adapted` for contactwith either crank arm 20 wherebyto complete the connection.

The construction of the plugs shown in Fig. 4 is preciselythe same as that shown. in

Fig. 2, and it will be evident thatby moving either direction, one of the the rod 34 in arms 20 will .beengagedby vthe point With this construction, either plug may be connected with theignition system, while the other is closed. Y

I claim: 1.' A sparking plug comprising a substantially cylindrical casing for screwing into a.

rthe rod having an annular rib adjacent to the valve forming one of the sparking points of the plug, the casing being provided \With another oint Within the same, a cap connected wlth the tube and inclosing the end of the rod, a crank arm journaled in the end of the cap and provided with a socket for engaging the squared end of the rod, and a spring encircling the crank arm and engaging the cap for the urpose set forth.

V"'2. A device of tie class described, coml prising a casing for screwing into a cylinder,

the inner end of the casin being formed into a valve seat, a longitudinally movable rod mounted in the casing, said rod having on its inner end a valve for coperating with the seat to shutoff the casing from the cylinder, .,one of the-'sparking points of the plu being'on the rod adjacent to the valve and the other on the casing above the valve, said rod having a threaded portion, an insulating bushing for the rod, a tube Within the bush-l ing and having a threaded portion for enclosing the communication between the cas- I ing and the cylinder, a rod in the casing and insulated therefrom, one of the sparking.

points of the plug being connected with the casing and inside thereof, and the other on the rod within the casing and separated from the first named point when the valve is closed, said rod having a threaded portion, a tube Within-which the rod is journaled and having a threaded portion coperating with the threaded portion of the rod, and means. for rotating. t-he rod.

4. Tn a device of the class described, a plurality'of series of plu s, each plu ing a casing, a valve or closing the same, a spring normally retaining the valve closed, the sparking oints of the plug being within the casing andl connected therewith and with the valve respectively, and means for simultaneously opening the valves of either series.

5. An' auxiliary s arklplug com rising a hollow holder rovi ed with an en wall in which a port 1s formedyand a spark plug insulator mounted in said holder and vprovided with an adjustable electrode rod carrying a member which closes the port when the plu is not in use. v

LEUTHERE PAULDU PONT. Witnesses:

IsADoRn MERZBACHER, MARY E. LOGAN.

compris- 

